Update VSIX to work with Dev17

[DefaultRyan]

This updates the VSIX to work with Dev17 (VS 2022) Preview.

One thing I learned is that the VCTargets install path was deprecated starting in VS2019, so I had to update it to an explicit path under MSBuild.

See:

• https://docs.microsoft.com/en-us/visualstudio/extensibility/set-install-root?view=vs-2019
• https://docs.microsoft.com/en-us/cpp/build/reference/msbuild-visual-cpp-overview?view=msvc-160

The second link suggests that the new path won't work in VS2017, and I thought we didn't still support VS2017, so I've moved up the minimum VS version from 2017 to 2019.

[DefaultRyan]

/azp run

[azure-pipelines]

No pipelines are associated with this pull request.

[sylveon]

Could you consider taking a look to #918 to see if we can roll it in at the same time?

[kennykerr]

If @jlaanstra is happy with this that's good enough for me.

[tim-weis]

Dropping VS2017 support is somewhat unfortunate. VS2017 has one distinct feature that all successors are missing: The ability to deploy an application from layout to a USB-attached Windows 10 Mobile device, allowing immediate on-device debugging.

Unless I'm the Last Man Standing that still supports Windows 10 Mobile for several applications, could you re-evaluate the cost/risk/effort of continuing VS2017 support, and ideally re-enable VS2017 that support?

[kennykerr]

@tim-weis can you use an older version the VSIX for your VS 2017 install? Sadly as it is, we hardly have the resources to keep the VSIX running with the latest version.

[s-wtnb]

@kennykerr Where can I find older versions of VSIX for VS 2017?
Do I need to build from C++/WinRT source code(contains VSIX) prior to the 2.0.210505.3 version that has this fix?

[kennykerr]

I don't actually know. I assumed the marketplace lets you download older versions, but there doesn't appear to be anything obvious there for finding older versions. Perhaps you can fiddle with the download link.

https://aka.ms/cppwinrt/vsix

[s-wtnb]

thx!
I was able to get the old VSIX by changing the version part of the URI in the download link.

ex)
2.0.210505.3